Qualified 304 stainless steel is a high-quality material, it should not precipitate heavy metals at any temperature. This means that whether you use this stainless steel product in the cold winter or in the hot summer, there will be no heavy metal ions released into your food or drinking water. However, unqualified stainless steel products may precipitate heavy metal ions in their water under specific conditions, such as acid, alkali and salt. Although temperature has some effect on these processes, the effect is negligible.

Time is the main factor. Therefore, it is not recommended to buy products such as thermos cups and water cups on the ground, because they may not meet the quality standards. In contrast, everyday items such as cutlery, vegetable basins and washbasins can be bought and used with confidence. These items are in contact with water and food for a relatively short time, and most of the dissolved matter or rust is removed during scrubbing. Therefore, their health effects are very weak, and even the amount of heavy metals ingested in a few years is not as much as a plate of stir-fried bracken.

As for the change of 304 stainless steel at different temperatures, it will turn slightly yellow at 150 ° C, significantly yellow at 250 ° C, and seriously yellow at 350 ° C. When the temperature reaches about 400 ° C, the stainless steel will become colored and appear yellow. These problems are not major and are usually caused by the oxidation of iron to iron oxide.

In addition, the color change phenomenon is caused by the formation of oxides of chromium-nickel elements. When you make acidic food with this stainless steel, these oxides may be dissolved and migrate into the food. Therefore, when choosing stainless steel products, it is very important to ensure that they are qualified products that meet the standards.